GOSS · Gossamer Bio, Inc. · Shareholders & Ownership

$9.28 -0.17 (-1.80%) At close · Nov 3 Play latest call Q2 2026 earnings call transcript

Market Cap

$57.75M

6.11M

Volume · Nov 3 139.45K Avg daily vol (38 sessions) 273.69K

Every disclosed holder of GOSS in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns GOSS

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	144	4,455,470	72.91%	Yes
Insiders (Forms 3, 4, 5)	7	113,336	1.85%	Yes
13D/G-only blocks	4	604,693	9.90%	Yes
Remaining	—	937,085	15.34%	Rest
Registered funds (N-PORT, not summed)	29	177,692	2.91%	No

Shares outstanding: 6,110,584, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of GOSS

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	D. E. Shaw & Co., Inc. 13F CIK 1009207 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	511,991	8.38%	+507,123	Jun 30, 2026	carried, not yet filed for the newest quarter
1.1	D. E. Shaw & Co., L.P. 13D CIK 1009268 · Registered investment adviser · Oct 27, 2026 Item 4 purpose: not restated by this amendment, the earlier 13D's purpose stands not summed	255,431	4.18%	-114,028	Oct 27, 2026	not summed
2	683 Capital Management, LLC 13F CIK 1404574 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	489,986	8.02%	+427,486	Jun 30, 2026	carried, not yet filed for the newest quarter
3	DeepCurrents Investment Group LLC 13F CIK 1754535 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	470,813	7.70%	+470,813	Jun 30, 2026	carried, not yet filed for the newest quarter
4	Context Capital Management, LLC 13F CIK 1301396 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	361,831	5.92%	+361,831	Jun 30, 2026	carried, not yet filed for the newest quarter
5	Worth Venture Partners, LLC 13F CIK 1696778 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	312,724	5.12%	+312,724	Jun 30, 2026	carried, not yet filed for the newest quarter
6	Opaleye Management Inc. 13G CIK 1595855 · Registered investment adviser · Jul 22, 2026 Rule 13d-1(c), passive investor	311,782	5.10%	—	Jul 22, 2026	Rule 13d-1(c), passive investor
7	AQR CAPITAL MANAGEMENT LLC 13F CIK 1167557 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	195,375	3.20%	+68,789	Jun 30, 2026	carried, not yet filed for the newest quarter
8	GSA CAPITAL PARTNERS LLP 13F CIK 1362033 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	187,337	3.07%	+146,659	Jun 30, 2026	carried, not yet filed for the newest quarter
9	Artal Participations S.a r.l 13G CIK 1218180 · Unknown · Dec 14, 2023 Rule 13d-1(c), passive investor, unconfirmed, last confirmed Dec 14, 2023	163,861	2.68%	—	Dec 14, 2023	Rule 13d-1(c), passive investor, unconfirmed, last confirmed Dec 14, 2023
10	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	145,374	2.38%	+130,151	Jun 30, 2026	carried, not yet filed for the newest quarter
11	Kalehua Capital Management LLC 13F CIK 2106181 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	139,367	2.28%	+11,413	Jun 30, 2026	carried, not yet filed for the newest quarter
12	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	117,700	1.93%	+268	Jun 30, 2026	carried, not yet filed for the newest quarter
13	ARCH Venture Management, LLC 13F CIK 1274403 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	100,699	1.65%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
14	BARCLAYS PLC 13F CIK 312069 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	97,907	1.60%	+59,584	Jun 30, 2026	carried, not yet filed for the newest quarter
15	Octagon Capital Advisors LP 13F CIK 1839435 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	96,875	1.59%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
16	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	95,874	1.57%	-114,460	Jun 30, 2026	carried, not yet filed for the newest quarter
16.1	BlackRock, Inc. 13G CIK 2012383 · Holding company · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	61,132	1.00%	-127,189	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
16.2	iShares Biotechnology ETF Fund S000004350 · Registered fund · Jun 30, 2026 iShares Trust, not summed	18,764	0.31%	-118	Jun 30, 2026	iShares Trust, not summed
16.3	iShares Core S&P Total U.S. Stock Market ETF Fund S000004317 · Registered fund · Jun 30, 2026 iShares Trust, not summed	3,675	0.06%	+88	Jun 30, 2026	iShares Trust, not summed
16.4	Diversified Equity Alpha Master Portfolio Fund S000004282 · Registered fund · Jun 30, 2026 Master Investment Portfolio, not summed	635	0.01%	-179	Jun 30, 2026	Master Investment Portfolio, not summed
17	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 13F CIK 1164508 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	94,667	1.55%	+94,667	Jun 30, 2026	carried, not yet filed for the newest quarter
18	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	92,900	1.52%	+33,139	Jun 30, 2026	carried, not yet filed for the newest quarter
19	SAMSARA BIOCAPITAL, LLC 13F CIK 1744967 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	90,282	1.48%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
20	Qube Research & Technologies Ltd 13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	88,322	1.45%	+26,850	Jun 30, 2026	carried, not yet filed for the newest quarter
21	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	86,387	1.41%	0	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
22	Invus Public Equities, L.P. 13G CIK 2005369 · Unknown · Dec 31, 2024 Rule 13d-1(c), passive investor	78,236	1.28%	-100,908	Dec 31, 2024	Rule 13d-1(c), passive investor
23	Hasnain Faheem Insider CIK 1352620 · Jan 2, 2026 Director, President & CEO, issuer-wide	78,073	1.28%	+3,500	Jan 2, 2026	Director, President & CEO, issuer-wide
24	Corient Private Wealth LLC 13F CIK 1948780 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	70,409	1.15%	+20,592	Jun 30, 2026	carried, not yet filed for the newest quarter
25	Siren, L.L.C. 13F CIK 2005245 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	65,112	1.07%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
26	HHLR ADVISORS, LTD. 13F CIK 1762304 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	62,176	1.02%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
27	Growth Equity Opportunities 18 VGE, LLC 13D CIK 1917895 · Unknown · Feb 23, 2026 Item 4 purpose: Other	50,814	0.83%	—	Feb 23, 2026
28	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	38,672	0.63%	+15,127	Jun 30, 2026	carried, not yet filed for the newest quarter
29	Squarepoint Ops LLC 13F CIK 1642575 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	31,955	0.52%	-10,529	Jun 30, 2026	carried, not yet filed for the newest quarter
30	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	31,020	0.51%	-30,726	Jun 30, 2026	carried, not yet filed for the newest quarter
31	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	30,033	0.49%	+27,690	Jun 30, 2026	carried, not yet filed for the newest quarter
32	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	28,041	0.46%	-104	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
33	MB Generational Wealth, LLC 13F CIK 2009056 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	27,718	0.45%	+8,566	Jun 30, 2026	carried, not yet filed for the newest quarter
34	JACOBS LEVY EQUITY MANAGEMENT, INC 13F CIK 884414 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	27,343	0.45%	+6,154	Jun 30, 2026	carried, not yet filed for the newest quarter
35	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	26,437	0.43%	+26,437	Jun 30, 2026	carried, not yet filed for the newest quarter
36	Alyeska Investment Group, L.P. 13F CIK 1453072 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	25,643	0.42%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
37	ACADIAN ASSET MANAGEMENT LLC 13F CIK 916542 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	22,402	0.37%	-43,572	Jun 30, 2026	carried, not yet filed for the newest quarter
38	HSBC HOLDINGS PLC 13F CIK 873630 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	19,789	0.32%	+18,365	Jun 30, 2026	carried, not yet filed for the newest quarter
39	Ensign Peak Advisors, Inc 13F CIK 1454984 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	18,137	0.30%	-3,140	Jun 30, 2026	carried, not yet filed for the newest quarter
40	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	15,567	0.25%	-1,987	Jun 30, 2026	carried, not yet filed for the newest quarter
41	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	15,358	0.25%	+14,199	Jun 30, 2026	carried, not yet filed for the newest quarter
42	Hennion & Walsh Asset Management, Inc. 13F CIK 1861642 · Investment adviser · Sep 30, 2026	14,203	0.23%	+467	Sep 30, 2026
43	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	14,106	0.23%	-651	Jun 30, 2026	carried, not yet filed for the newest quarter
44	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	13,934	0.23%	-40,917	Jun 30, 2026	carried, not yet filed for the newest quarter
45	DEUTSCHE BANK AG\ 13F CIK 948046 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	13,831	0.23%	-2,493	Jun 30, 2026	carried, not yet filed for the newest quarter
46	NEA Management Company, LLC 13F CIK 1512848 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	12,500	0.20%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
47	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	12,407	0.20%	-6,469	Jun 30, 2026	carried, not yet filed for the newest quarter
47.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · Aug 31, 2026 SCHWAB STRATEGIC TRUST, not summed	12,223	0.20%	-112	Aug 31, 2026	SCHWAB STRATEGIC TRUST, not summed
48	SMITH, MOORE & CO. 13F CIK 200724 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	11,250	0.18%	+5,375	Jun 30, 2026	carried, not yet filed for the newest quarter
49	Christian Waage Insider CIK 1553179 · Jan 2, 2026 EVP, Tech Ops and Admin, issuer-wide	11,028	0.18%	+1,289	Jan 2, 2026	EVP, Tech Ops and Admin, issuer-wide
50	Giraudo Bryan Insider CIK 1740847 · Jan 2, 2026 Director, issuer-wide	10,872	0.18%	+1,447	Jan 2, 2026	Director, issuer-wide

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 168 holders

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Key facts CIK 1728117 CUSIP 38341P201 13F (30d) 20 filings 13 filers Visit website Investor relations